This is just too small for an everyday aquarium for any fish. It does have a place though. I think it works well as a holding bowl for a betta or guppies while the main aquarium is being cleaned. It also serves well as a hospital bowl for a sick or injured fish or one on medication or one that has been bullied by other fish. Keeping a fish in this enclosure by itself for an extended period of time is no good. Put it next to another bowl or aquarium so the fish in it can see tank mates and know it is not alone. Give the fish in this bowl more attention than you normally would. He needs to be able to interact with either you or another fish. Put part of a plant in the water and float some duck weed on top of the water. Betta fish need to be kept engaged even when sick or stressed.

To keep a fish in this on a dresser by itself would be cruel. But keeping a fish with some plant matter and situated near another fish in a similar bowl would be better.